Based on the trade theories, which of the following statement is NOT true?
a. Trade occurs because of differences in the availability of factor inputs across countries and differences in the proportions of those factor inputs used inproducing different products.
b. Trade causes expansion in the export-oriented sector and causes contr action in the import-competing sector.
c. Trade allows a trading nation to consume beyond its production capacity.
d. Trade benefits everyone or every group within a trading nation.